Automatic air-pump.



PATENTED SEPT. 3, 1907.

E. J. ROHRBACHBR. ATOMATIG AIR BUMP.

APPLIOfATION `FILLED APR.22. 1907.

[NME/Wok.

A Mole/VE YS .air to any desired pressure`,.and when that reached, to automatically stop.

UNTTED STATES PATENT oEEIoE. f

EIMVARD JfKQHHBAClIER, OF BLAINE, WASHINGTON.

To all ulzom it muy concern.:

Beit known that l, .Eowann I. .Ronan-ionen, a citizen ol the United States, residing at Blaine, in the l county ol Whatcom and State of \\"ashington, have inwhich ,the following is a specification.

This invention relates tolair pumps,v andhas for its principal objectto provide a pump for use in connection with automobiles, whistle tanks lo r for general use where air is'to be forced under pressure into a suitable reservoir or-tank, or into a tire.

One oitlre principal objects of the invention is 'to proridea pump which may be set or adjusted'ff pump pressure is v `vented a new and usefulnutomatic Air-Pump, of

.A lfurther object of the' invention is to providean improved `form of pump inwhich a portion oi the corn- L vassed air is utilized a means for forcing the pump to-inoperative position when the desired pressure -hasv been a-ttaine l,

i still further object oi the invention is to provide lan improvedmeansfor adjusting the degree of pressure to which the air may be pumped.

With these vand other objects in view, as will more i iully hereinafter appear, the inventionconsists in certain .novel features of construction, and arrangement of parts, hereinaftery iully described, illustrated; in the accompanying drawings, and particularly pointed out in the appended claims, yit being understood that various changes in the form, proportions,v size and minor details oi the structure may be made Without departing from the spirit or sacrificing any oi the advantages of the invention. l In the accompanying drawingsI-Figure 1 is a sect tional Ielevationot` a pump constructed in accordance with the invention. f Fig. 2 is a detail sectional view' of the upper'portion ofthe cylinder and piston by which the pump is moved to inoperative position.

Similar numeralsof reference areemployed to indicate corresponding parte throughout the `several iigures oi the drawings.

The `working parts of the pump lare mounted on a suitable base. 10 which may be arranged at any convenient point, and iused in connection with an automobile or the like is disposed adjacent to the fly wheel 1l. oi the engine. Arranged above the base is apump cylinder 15 having at oneend a downwardly projeeting frame 16 that is ulcrurned .to a lug 17 projecting` iron the base, and to the rear Vend of thecylinder issecured an arm 17 at the outerendvoi lwhich is formed a bearing for the reception of a friction Wheel 18 the lati ter lic-ing moved into and from engagement withthe specification orLetters rasant.' ppl'ication filed April 22,1907.

friction wheel 18.

that the pressure inV the; reduced periphery ol the ily wheel 1 1 and constituting the actuating device of the pump. The arm 17 is provided with a downwardly extending. lug or arm 2O that is ar- Patented Sept. 3, 1907.' serai Nusael.,

ranged immediately above a cam lever 21 thatiscarried by a suitable standard 22arrange`d on the base, and by turning the cani` leverthe pump nieml-)cmnay be raised in order to disconnect `the friction-wheel from the lly Wheel and stop the operation oi the pump.

. Fitting within the cylinder is a piston or plunger '23 that is connected by a-rod 24 to a Wrist pin 25 on' the The piston is Arecipr'ocated -within ghe' cylinder, and on one stroke ddraws air through a suitable inlet 27, and on the stroke in the opposite di'- a reservoir 29, or to an automobilel tire orother place Whereair is to bestored. 'In the connection 28` is arpermit the passage of theairfrom the pump cylinder..

`rection forces such vair through a discharge pipe 28 into cally arranged cylinder 32 thatvis open at its lower end.

and' is counter-bored. The main-bodyof the cylinder.

receives a plunger or'piston34 having at its upperI ,end

a reducedr stem 35 that fits within the'reduced portion of the bore ofthe cylinder, and this portion 36 of the' cylinder is 4placed in "communication, with the reservoir or thezpipe ZASY'by a'small connecting pipe 40,s0

inder may be at all times the same as that in the reservoir. i

1n the upper portion of'the cylinder 32 are arranged a number of ley-pass ports 42 which place the larger. and smaller portions of the cylinder in communication with. ch other, and these ports are underthe control, of thc reduced stem 3510i the piston'when the latter is i inthe position 'shown in Fig. 1 and .it is notruntil the` pressure increases to anextent suiiicient to elevato the cylinder 33 that the'air may. pass through the port 42 and engage with the upper, end of the main body of the piston 34. lThe lower end of the piston y34' rests on a lleaf spring 43, said springbeing secured atone end to a .lug 44 that is. carried by the base, and it is provided at its opposite end with a screw 46 which maybe adjusted for` the purpose of altering the upward stress on the jpiston or plunger 34, and by suitably adjusting this spring the degree of pressure necessary to raise the cylinders 32, and l5 may be alteredas required.

The upper portion '35 0i the piston is provided withv ports 47 leading from the/periphery of thefpiston,I to a 100 central portion 48 ,that communicates with the upper end of the piston. y lhe top of the port 48 is provided `with a seatvior a. valve 49,Y the stem of said valve exj ltending through a guidingopening formediir the upper portion of thepiston, and' the` lower end of said stem' is 105 engaged .by a spring 49 that tends to hold the valve in closed position. l i

1 When the air inlet pressure has forced the mechan# ism to inoperative position, the airwhich has passed through the ports 42 t0 the upper portion of the cylin- 110v 

